For me, it is 12 (soon to be 13) from YYZ, with LHR and ORD tied for second at 5 each, as follows:
YYZ - DC-8-60 (Air Canada)
727 (United)
707-300, 400 (BOAC, Transair, American, BWIA)
747-100, -200, -400 (BOAC, British Airways, Wardair, Air Canada)
DC-9 (Republic, Air Canada)
L-1011-100, -500 (Air Canada, Worldways)
767-200, -300 (Air Canada)
A320 (Air Canada, Skyservice)
A319 (Air Canada, United)
737-300, -700 (United, WestJet)
MD-83 (Jetsgo)
A330 (Air Canada)
LHR - DC-8 (Air Canada)
707-400 (BOAC)
747-100, -200, -400 (BOAC, British Airways, Air Canada)
767-200, -300 (Air Canada)
A330 (Air Canada)
ORD - DC-8 (United)
727 (United)
737-300 (United)
A319 (United, Air Canada)
757-200 (United)
Martin
YYZ - DC-8-60 (Air Canada)
727 (United)
707-300, 400 (BOAC, Transair, American, BWIA)
747-100, -200, -400 (BOAC, British Airways, Wardair, Air Canada)
DC-9 (Republic, Air Canada)
L-1011-100, -500 (Air Canada, Worldways)
767-200, -300 (Air Canada)
A320 (Air Canada, Skyservice)
A319 (Air Canada, United)
737-300, -700 (United, WestJet)
MD-83 (Jetsgo)
A330 (Air Canada)
LHR - DC-8 (Air Canada)
707-400 (BOAC)
747-100, -200, -400 (BOAC, British Airways, Air Canada)
767-200, -300 (Air Canada)
A330 (Air Canada)
ORD - DC-8 (United)
727 (United)
737-300 (United)
A319 (United, Air Canada)
757-200 (United)
Martin
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